Drop-hammer



. W W. STOLER.

DROP HAMMER.

APPLICATION FILED MAR. 29, 1 919.

Patented May' 31 1921. 4 SHEETS-SHEET 1.

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DROP HAMMER. APPLICATION mum/nus, 1919.

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DROP HAMMER. APPLICATION FILED MAR. 29. 1919.

Patented May 31, 1921.

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DROP HAMMER.

APPUCATION FILED 113K29 1919 1,380,326. Patented May 31,1921.

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UNITED v STATES PATENT @FFICE.

WARREN W. STOLEB, OF DETROIT, MICHIGAN.

DROP-HAMMER.

To all whom it may concern:

Be it known that I, T/VA REN V7. SToLnR, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Drop- Hammers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to drop hammers and "has special. reference to that type of power operated hammer that may be used for forging or other purposes, the hammer being raised by power to drop by gravity and with such hammers various devices and appurtenances are employed for automatically and manually controlling the operation of the hammer. 7

My invention aims to improve hammers of the above type by making the same more durable in many respects. the first place, such hammers are subjected to vibrations which tend to rack the entire structure by loosening bolts, tie rods, shifting guides and likewise throwing parts out of alinement so that accurate blows cannot be struck by the hammer. It is in this connection that I have a construction which permits of parts being easily renewed and adjusted.

My invention still further aims to providea drop hammer wherein all of the parts are constructed and assembled to withstand. the heavy duty to which machines of this type are subjected, and besides, there are certain novel features or refinements that contribute to a hammer possessing a high degree of efficiency. Y

My inventionwill be hereinafter specifically described and then claimed, and reference will now be had to. the drawings wherein- Figure 1 is a front elevation of a drop hammer in accordance with my invention;

Fig. 2 is a side elevation of the same;

Fig. 3 is a detail sectional view of the cushioning member for a bolt or tie rod;

Fig. 4 is an enlarged horizontal sectional view taken on the line IV-I V of Fig. 1;

Fig. 5 is a detail sectional view of a portion of the drop hammer, illustrating the clutches in side elevation;

Fig. 6 is a detail sectional view of a por- Application filed March 29, 1919.

Serial No. 285,989.

Fig. 7 is a longitudinal sectional view of an adjustable detent forming part of the machine;

Fig. 8 is a cross sectional view of the same;

. Fig. 9 is a longitudinal sectional view of a portion of a frame, showing the adjusting mechanism thereof;

. Fig. 10 is a horizontal sectional View taken on. the line XX of Fig. 9, and

Fig. 11 is a horizontal section of the upper portion of the machine.

Specification of Letters Patent. Patented May 31, 1921,

In describing my invention by aid of the views above referred to, I desire to point out that the same are merely illustrative of the drop hammer as now constructed, and I do not care to confine my invention to the precise construction and arrangement of parts shown. The, following description is therefore to be broadly construed as including substitute constructions and arrangement of parts which are the obvious equivalents of those to be hereinafter referred to.

In the drawings, the reference numeral 1 denotes a base or pedestal for the feet 2 of opposed frames 3 and 4, and the feet 2 are anchored on the pedestal 1 by angnlarly disposed tie rods 5. The angularity of these tie rods eliminates any shearing action of the frames 3 and 4; relative to said rods, and when it is desired to adjust the frames 3 and 4, the tie rods are loosened and lateral T bolts 6 adjusted. These T bolts arebest shown in Figs. 9 and 10 and each T bolt extends through a depending lug 7 carried by each of the frames 3 and 4, said T bolts having cross heads 8 against the inner side walls of the pedestal l and spanning the recesses 9 of said pedestal into which the Between the upper ends of the frames .3 and 4 and extendmgtherem are sleeves 14 and extending through the upper ends of said frames and said sleeves are tie rods 15, said tie rods coiiperating with the sleeves 14 in tying the upper ends of the frames together.

Seated on the upper ends of the frames 3 and 4 is a housing 16 connected to said frames by vertically disposed tie rods 17. The housing 16 has side bearings 18 and 19, and journaled in said bearings Band 19, at one side of the machine, are the eccentrically disposed trunnions or spindles 20 of a shaft 21, said shaft having crank V 22 at one end thereof so that said shaft may be rocked. Loose on the shaft 21 is a hoisting drum' 23 having one'end thereof provided with a gear wheel 24. i

Journaled in the bearings 18 and 19, at the rear side of the machine, are the-ends 25 of a yoke 26 and journaled in the ends 25 of the yoke is a driven shaft 27 having one end thereof provided with a pulley or belt wheel 28 adapted to be driven from a motor {or suitable source of power (not shown). Fixed .onthe driven shaft 27 is a hoisting drum 29 and gear wheel 30, said gear w el meshing with the gear wheel 24 of the hoisting drum 23. The shaft 27 is eccentrically disposed relative to the ends 25 of the yoke 26, so that when the yoke 26 is rocked the hoisting drum 29 may be shifted to and from the hoisting drum 23. To accomplish this, a rod 31 is connected to the yoke 26, as best shown in Fig. 2 and the lower end of the rod extends through a bracket 32, carried by one of the frames of the machine, preferably the frame 3, and is provided with nuts 33 which may be adjusted to raise or lower the rod 31 and thus set the hoisting drum 29 in a desired position relative to the hoisting drum 23.

At the ends of the hoisting drums 29 and 23 are beveled splash members 34 knurled or spirally grooved so as to gather and discharge grease and other matter that may adhere to a hammer board 35 between the hoisting drums and adapted to be elevated thereby. The hoisting hammer board 35' extends downwardly through an opening 36 in the housing 16, between the guides 13 of the frames 3 and 4 and is suitably attached to a hammer head 37 slidable on the guides '13. The hammer head 37 has provision for holding a suitable blow head (not shown) and. said hammer head is movable to and from a stationary anvil 38 on the pedestal 1 of the machine. The anvil 38 also has provision for holding a piece of work. Connected to the crank 22 of the shaft 21 is a depending rod 39, and pivotally and adjus ably connected to said rod, as at 40, is a curved lever 41 having the long arm thereof extending into the path of a pin 42 carried by the hammer head 37. The short arm of the curved lever 41 is pivotally connected, as at 43, to a link 44 and said link is pivotally connected, as at 45, to a block 46 adjustably held in guides 47 of the frames 3 and 4. From this arrangement, it is apparent that the upward movement of the hammer head 37 is automatically controlled by the pin 42 impinging against the lever 41, said lever shifting the rod 39 to rock theshaft 21 and thereby move the loose hoisting drum 23 relative to the hammer board 35. With the hoisting drum 23 shifted in this 'manner, there is not sufiicient pressure of the drums 23 and 29 to further elevate the hammer board 35, and the hammer head 37 may descend by gravity to operate on a piece of work on the anvil 38.

To'hold the hammer head 37 elevated, novel clutches are employed for gripping the hammer board 35 andtheclutch mechanism is located in housing 16 and best shown in Figs. 4 and 16 beneath lugs 48 is a plate 49 provided with an opening 50 .sothat the hammer board 35 may extend therethrough. On the plate 49 are sets of bearings 51 and-journaled in said bearings are 'shafts'52 and 53 provided with cams 54. On the cam 54 of the shaft 52 is a shoe or gripping member SlidabI-e on the housing 55 to engage one side of the hammerboard 35. Engaging the other side ofthe hammer board 35 is a shoe or gripping member56 pivotally connected as at 57 to a slide block 58 and this slide block is adapted to be shifted by the cam 54 of the shaft 53. The

slide block 58 is held against vertical displacement by side extensions 59 thereof engaging under flanges 60 of the plate 49.

One end of the shaft 52 is provided with a crank 61 and pivotally connected to the end of said crank is a reach rod 62 having the lower end thereof adjustably and pivotally connected, as at 63, to atreadle 64 supported by the pedestal of the machine.

The shaft 53 has an end thereof provided with a crank 65 and pivot-ally connected to the outer end of said crank is a rod 66,- V

tent or latch 70 having an outer beveled end 71 in the path of the hammer head 37, so as to be actuated thereby. The detent'70 has a bore 71 with the walls thereof screwthreaded tn receive the exteriorly screwthreaded head 7 3 of arod 74, said rod extending through a bushing 75 screwed in an end of the opening 69 opposite that end of said opening in which the detent is located.

Encir'cling the rod 74, between the bushing 75 and the detent'70 or the head73 of they 7 rod 74, is a coiled compression spring 76, and on the outer end of the rod 74'is fixed an arm 77, adapted to extend between lugs 78 on the frame a.

The detent 70 has a vertical slot 79 normally registering with vertical openings 80 and 81 in the enlargement 68 and bolt head 73 respectively.

Extending through the upper part of the opening 80 of the enlargement 68 into the slot 79 of the detent 70, and engaging the bolt head 73 is a plunger 82, carried by a head 83 fixed on the lower end of the rod 39 and against a collar 841 carried thereby. The head 83 is held in engagement with the rod 39 by a wedge member 85 in contradistinction to bolts andnuts and the lower end of the rod 39 slides in a portion of the enlargement 68.

Pivotally connected to the enlargement 68 is a controlling lever 86 adapted to be swung into engagement with the lower end of the rod 39 to elevate the same. The lever 86 is adapted to be held in engagement with the lower end of the rod 39 by a pivoted latch or keeper 87 carried by the enlargement 68 and said latch or keeper is held in position by a spring pressed pin 88 to automatically engage the lever 86 when said lever is swung against the latch or keeper.

To prevent the hammer from being racked or seriously vibrated, the majoritiy of the bolts or tie rods, particularly those designated 17, 5, 6, and 15, are provided with cushioning members 89, ,one of which is shown in detail in Fig. 3. The cushioning members 89 surround the bolts or tie rods and are housed by cups 90 placed upon the bolts or tie rods, with washers 91 extending into the cups on to the cushioning members which are preferably made of rubber.

In operation, I will assume that theshaft 27 carrying the fixed hoisting drum 29, is being driven and a rotary movement imparted to the loose hoisting drum 23, and

that the hammer head 37 is being elevated by said hoisting drums. During such movement, the pivoted shoe or gripping member 56 is slightly tilted and the shoe or gripping member 55 is slightly retracted by reason of the attendant or operator of the hammer having his foot on the treadle 64:. As the limit of movement of the hammer head 37 is reached, the pin 42 impinges against the lever 41, raises the rod 39 and through the medium of the crank 22 the shaft 21 is rocked and the hoistingdrum 23 is shifted to cause cessation in the elevation of the hammer board 35.

When the hammer head 37 descends to strike ablow the detent 7 O is shifted, placing the opening 81 of the bolt head 73 in position to receive the lower end of the plunger 82, which descends by gravity andshifts the loose hoisting drum 23 into engagement with upstroke of the hammer head, the treadle 64:

may be released causing the shoes or gripping members 55 and 56 to engage and hold the hammer board 35.

To control the stroke of the hammer board 35 so that the desired blow may be obtained, the lever 86 may be shifted into engagement with the lower end of the rod 39 to elevate the same, at any point during the elevation of the head 37, thus releasing the hoisting drum so that the head 37 may descend. In this manner a heavy or light blow may be delivered and by placing the lever 86 in engagement with the latch or keeper 87, the rod 39 will be held in an elevated position with the hammer inoperative.

What I claim is:

1. A drop hammer having a base and opposed frames thereon, depending lugs car ried by said frames and extending into the hammer base, T bolts for laterally adjusting the frames on the base and extending through said lugs and each bolt having an exposed head against the inner wall of said base, a nut against the opposite side of each lug so that the bolts may readily be removed without lifting said frames from said base, and means for anchoring said frames on said base. y

2. In a drop hammer having frames, a hammer head, hoisting means for the head, and means carried by one of said frames adapted to be actuated by the hammer head when lowered to render said hoisting means active for raising the hammer head, said means comprising a detent slidable in the hammer frame and having a screwthreaded bore, a rod having a head with a hole therethrough, said rod being adjustable in the detent bore, a bushing in the hammer frame slidably supporting the detent rod, a spring in the hammer frame between said bushing and said rod head maintaining said detent normally protruding from said frame in the path of the hammer head, an arm 011 the outer end of said rod to facilitate adjusting the head of said rod in said detent, and a plunger adapted to be released by said rod to render said hoisting means active.

In testimony whereof I affix my signature in the presence of two witnesses.

WARREN W. STOLER. Witnesses:

KARL H. BUTLER, ANNA M. Donn. 

